JP2005088698A - Vehicle body front structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body front structure of an automobile capable of stably giving a turning force to the outside of the vehicle to the lower side of an obstacle that collided with the automobile with a compact structure in comparison with conventional invention, and capable of reliably preventing dragging into the lower part of the vehicle. <P>SOLUTION: A first impact absorbing member 5a is arranged between a bumper armature 4 and a bumper fascia 6, and a second impact absorbing member 5b having rigidity in the longitudinal direction of the vehicle set higher than that of the first impact absorbing member 5a is arranged along the lower face of the first impact absorbing member 5a and the bumper armature 4. A plate-like member 3 is provided along the lower face and the rear face of the second impact absorbing member 5b, and the plate-like member 3 is fixed to the bumper armature 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vehicle body front structure.

  Conventionally, the front structure of an automobile body absorbs an impact acting on the vehicle body when it collides with an obstacle to protect the occupant, and also absorbs and protects an impact acting on the impacted obstacle. Must be configured.

Therefore, by installing a protruding member inside the spoiler part of the bumper fascia and fixing the protruding member to the body frame (side member) via the bracket, when the automobile collides with the obstacle, A technique in which the obstacle is mounted on a front hood by applying a rotational force to the hood is known (see Patent Document 1).
JP 2001-88634 A

  However, in the conventional vehicle body front structure of an automobile, a bracket for supporting the projecting member is required, and the distance between the projecting member and the vehicle body side is increased. There is a problem in that the design of the vicinity of the spoiler part and the layout of peripheral members are restricted.

  The present invention has been made paying attention to the above-mentioned problems, and the object of the present invention is to provide a vehicle with a more compact structure than the conventional invention and to the outside of the vehicle that has collided with the automobile. It is an object of the present invention to provide a vehicle body front structure that can stably apply a rotational force and can reliably prevent the obstacle from being caught in the lower part of the vehicle.

  In the first aspect of the present invention, the first shock absorbing member is disposed between the bumper armature and the bumper fascia, and the second shock absorbing member in which the rigidity in the longitudinal direction of the vehicle is set higher than that of the first shock absorbing member. It is disposed along the lower surface of the first shock absorbing member and the bumper armature, the plate member is provided along the lower surface and the rear surface of the second shock absorbing member, and the plate member is fixed to the bumper armature. To do.

  According to a second aspect of the present invention, in the vehicle body front structure according to the first aspect, the rear side of the plate-like member is refracted to form a U-shaped cross-sectional shape, and the U-shaped opposite horizontal portion Are connected to the bumper armature, both ends of the U-shaped vertical portion in the vehicle width direction are connected to the bumper stay, and the bumper stay between the vertical portions is formed in a straight line parallel to the vehicle width direction. .

  According to a third aspect of the present invention, in the vehicle body front structure according to the first aspect, the rear side of the plate-like member is refracted to form a U-shaped cross-sectional shape, and the U-shaped opposite horizontal portion Are connected to the bumper armature, and the both ends of the U-shaped vertical portion in the vehicle width direction are connected with the bumper stay and the bumper armature being sandwiched, and the bumper stay of the vertical portion is linearly parallel to the vehicle width direction. It is characterized by being formed.

  The invention according to claim 4 is characterized in that, in the vehicle body front part structure according to claim 2 or 3, a bracket for fixing a rear end portion of the bumper fascia is provided in a vertical portion of the plate-like member. To do.

  In the first aspect of the invention, when the automobile collides with an obstacle, the bumper fascia is crushed and displaced rearward to absorb the impact at the time of the collision. Although transmitted to both of the shock absorbing members substantially simultaneously, the second shock absorbing member is set to have higher rigidity in the vehicle front-rear direction than the first shock absorbing member. The second shock absorbing member is higher than the shock absorbing member. As a result, both the first and second shock absorbing members absorb the shock, and the second shock absorbing member acts as an obstacle toward the outside of the vehicle. It becomes possible to give a rotational force and prevent the obstacle from being caught in the lower part of the vehicle.

  In addition, since the second shock absorbing member is formed along the lower surfaces of the first shock absorbing member and the bumper armature, a sufficient compression stroke of the second shock absorbing member is ensured. Despite the fact that the rigidity in the vehicle front-rear direction is set higher than that of the first shock absorber, there is no possibility that bottoming will occur.

  The second shock absorbing member can be displaced rearward in a stable state by the plate-like member fixed to the bumper armature, and as a result, highly reproducible crushing control can be realized.

  In addition, since the second shock absorbing member is provided along the lower surface of the first shock absorbing material, there is no restriction on the design of the spoiler portion of the bumper fascia and the layout of the peripheral members as in the conventional invention, and the compact configuration Thus, a desired effect can be achieved.

  According to a second aspect of the present invention, the rear side of the plate-like member is refracted to form a U-shaped cross-sectional shape, and opposing horizontal portions of the U-shaped are coupled to a bumper armature, respectively. Since both end portions in the vehicle width direction of the vertical portion of the character shape are coupled to the bumper stay and the bump past stays of the vertical portion are formed in a straight line parallel to the vehicle width direction, the plate-like member can be firmly fixed to the bumper armature.

Also, the bumper stays can be connected to each other by a high-rigidity member different from the bumper armature by the vertical portion.
That is, when the vehicle collides with an obstacle at a low speed, it is possible to prevent the distance between the two bumper stays from being expanded in the vehicle width direction, thereby allowing the rear members of both the bumper stays, for example, the radiator core support and the side member to move in the vehicle width direction. Therefore, it is possible to prevent the vehicle from being damaged due to the force applied to the vehicle, and to reduce damage to the vehicle body as compared with the conventional invention, thereby suppressing an increase in repair costs.

  In addition, the projecting member is directly fixed to the vehicle body frame as compared with the conventional invention, so that the vehicle frame is damaged by the impact even though the automobile collides with the obstacle at a low speed, and the repair cost increases. There is no risk of occurrence.

  In the invention according to claim 3, since the both ends in the vehicle width direction in the vertical portion are connected in a state of being sandwiched between the bumper stay and the bumper armature, these three members can be firmly fixed.

  In addition, since the two bumper stays can be connected to each other by a straight high-rigidity member through the vertical part, when the vehicle collides with an obstacle at a low speed, the distance between the two bumper stays can be prevented from expanding in the vehicle width direction. Can prevent the rear members of both the bumper stays, such as the radiator core support and the side members, from being damaged by receiving a force in the vehicle width direction, and can increase the overall rigidity of the engine compartment structure of the vehicle body even during normal times. .

In the invention according to claim 4, since the bracket for fixing the rear end portion of the bumper fascia is provided on the plate-like member, the wearing rigidity of the rear end portion of the bumper fascia is improved, and the automobile is an obstacle. It is possible to disperse and absorb the impact at the time of collision with the plate member from the bumper fascia through the bracket.
In addition, the length of the bracket can be shortened compared to the case where the conventional bracket is fixed to the hood lock stay, which can contribute to weight reduction.

  Embodiments of the vehicle body front structure of the present invention will be described below.

Embodiment 1 of the present invention will be described below.
FIG. 1 is an overall exploded view showing a front body structure of an automobile according to a first embodiment of the present invention, FIG. 2 is a side sectional view of the vicinity of a central portion in the vehicle width direction of the front body structure of the automobile according to the first embodiment, and FIG. It is a sectional side view of vehicle body front part structure of Example 1 near the vehicle width direction both ends.
FIG. 4 is a plan view showing a connected state of the bumper armature, the plate-like member, and the bumper stay, and FIG. 5 is a diagram for explaining the operation of the vehicle body front structure of the vehicle of the first embodiment.

  As shown in FIGS. 1-3, the vehicle body front part structure A of this embodiment includes a radiator core support 1, bumper stays 2, 2, a plate-like member 3, a bumper armature 4, an impact absorbing member 5a, 5b and Bumper Facia 6 are the main components.

  The entire radiator core support 1 is integrally formed of glass fiber reinforced resin, and side member mounting portions 1b and 1b are formed on the left and right sides of the radiator core support sides 1a and 1a.

The side member mounting portions 1b and 1b are fixed to the front end portions of the side members 7 and 7 with bolts and nuts not shown in the figure, and the rear ends of the bumper stays 2 and 2 are sided with bolts and nuts not shown in the drawing. The members 7 and 7 are connected to four locations at the front end portions, respectively.
The bumper armature 4 is connected to four locations at the front end portions of the bumper stays 2 and 2 by bolts and nuts not shown through a vertical portion 3b of a plate-like member 3 described later.
Further, a first shock absorbing member 5a integrally formed of a foam such as polyurethane or polypropylene is fitted and fixed to the front surface of the bumper armature 4.

A second shock absorbing member 5b integrally formed of a foamed material such as polyurethane or polypropylene is provided along the lower surface of the first shock absorbing member 5a and the bumper armature 4, and the second shock absorbing member 5b The rigidity in the vehicle longitudinal direction is set to be higher than that of the first shock absorber 5a.
The first shock absorbing member 5a and the second shock absorbing member 5b may be formed separately and joined to each other, or may be integrally formed by two-color molding or the like.
A bumper fascia 6 is disposed outside the shock absorbing members 5a and 5b.

Hereinafter, the plate-like member 3 will be described in detail.
The plate-like member 3 of the present embodiment is formed into a U-shaped cross-sectional shape that is formed by press-molding a metal plate using steel, aluminum, or the like and opened to the front side of the vehicle. 2 A horizontal support portion 8 a that is in close contact with the lower surface of the shock absorbing member 5 b, a vertical support portion 8 b that is in close contact with the rear surface of the second shock absorbing member 5 b, and a lower surface of the bumper armature 5. The horizontal support portion 8c is in close contact with the lower portion of the bumper armature 4 by a fastening member such as a clip C1. As a result, the second shock absorbing member 5b is moved downward and rearward by the plate-like member 3. Fixed and supported in a stable state.
In the present embodiment, the front end of the support portion 8a is in contact with the rear end portion of the wing portion 6a, and does not reach the front surface of the bumper armature 4, so that the support portion 8a is second. Consideration is given so as not to adversely affect the collapse control of the shock absorbing member 5b.

Both ends of the U-shaped vertical portion 3b in the vehicle width direction are firmly connected in a state of being sandwiched between the bumper stay 2 and the bumper armature 4 as described above.
The U-shaped upper horizontal portion 3c is fixed to the upper surface of the bumper armature 4 by a fastening member such as a clip C2, while the vehicle width direction central portion at the front end thereof is a rear end of the bumper fascia 6 by a fastening member such as a clip C3. It is fixed to the part.
That is, the plate-like member 3 of this embodiment is connected to the bumper armature 4 by the clips C1 and C2, and to the bumper fascia 6 by the clip C3.
The number and position of the clips C1 to C3 may be set as appropriate.

  As shown in FIG. 4, the bumper armature 4 of the present embodiment is formed in a shape in which both ends in the vehicle width direction are bent backward, and the vertical portion 3 b is parallel to the vehicle width direction between the bumper stays 2 and 2. As a result, the bumper stays 2 and 2 are in a state of being joined by a highly rigid linear member.

Hereinafter, the operation and effect of the vehicle body front part structure A of the vehicle according to this embodiment will be described.
In addition, although a present Example demonstrates the case where a pedestrian is applied as an example of an obstruction, the obstruction which the operation and effect is recognized by applying to this invention is not limited to a pedestrian.

In the vehicle body structure of the automobile thus configured, when the automobile collides with a pedestrian, the bumper fascia 6 collides with the pedestrian's knee and is crushed and displaced rearward.
At this time, since the rear end portion of the bumper fascia 6 is fixed to the plate-like member 3, the impact is also transmitted to the plate-like member 3 to be dispersed and absorbed.

Subsequently, as shown in FIG. 5A, the impact is transmitted to both the first and second impact absorbing members 5a and 5b substantially simultaneously.
At this time, since the rigidity of the second shock absorbing member 5b in the vehicle front-rear direction is set higher than that of the first shock absorbing member 5a, the reaction force against the impact caused by the pedestrian's knees is lower than that of the first shock absorbing member 5a. The second shock absorbing member 5b is higher, and as a result, as shown in FIG. 5B, the first and second shock absorbing members 5a and 5b are displaced rearward to absorb the shock, while the second shock absorbing member 5b is displaced. It is possible to reliably prevent the pedestrian from being caught in the lower part of the vehicle by the absorbing member 5b applying a rotational force (illustrated by an arrow in FIG. 5B) to the outside of the vehicle below the pedestrian's knee.

  At this time, since the plate-like member 3 supports the second impact absorbing member 5b from below and behind, the second impact absorbing member 5b can absorb and disperse the impact while being displaced rearward in a stable state.

  On the other hand, when the automobile collides with a rigid body (for example, a wall or a front vehicle) at a low speed, the straight vertical portion 3b serves as a beam between the bumper stays 2 and 2, so It is possible to prevent separation in the vehicle width direction, thereby preventing the rear members of both the bumper stays 2, 2 such as the radiator core support 1 and the side members 7, 7 from being damaged due to the force in the vehicle width direction, Compared to the conventional invention, damage to the vehicle body can be reduced and increase in repair costs can be suppressed.

  Further, since the plate-like member 3 has a shape along the lower surface of the shock absorbing member 5b, the center portion in the vehicle width direction of the horizontal portion 3a is formed to be the longest in the front-rear direction, and the section modulus is obtained at the center portion of the both end support beams. Has the effect of reducing the difference in rigidity depending on the impact location.

  Since only the plate-like vertical portion 3b is interposed between the bumper armature 4 and the bumper stays 2 and 2, when the automobile collides with a rigid body at medium and high speed, The first and second shock absorbing members 5a and 5b, the bumper armature 4, the bumper stays 2 and 2, and the side members 7 and 7 are crushed in order and the shock at the time of collision is transmitted and absorbed. There is no risk of adverse effects.

As described above, in the vehicle body front structure A of this embodiment, the rotational force to the outside of the vehicle below the obstacle that has collided with the vehicle with a compact structure compared to the conventional invention. Can be granted.
Further, since the second shock absorbing member 5b is supported by the plate-like member 3 from below and behind, the second shock absorbing member 5b can be stably displaced rearward, and the obstacle is moved to the lower part of the vehicle. Can be reliably prevented.

Embodiment 2 of the present invention will be described below.
The vehicle body front structure B of the vehicle of this embodiment is substantially the same as that of the first embodiment except for the plate-like member 3 described in the first embodiment. The description is omitted.

  FIG. 6 is an overall exploded view showing the front body structure of the automobile according to the second embodiment of the present invention, FIG. 7 is a side sectional view of the vicinity of the center in the vehicle width direction of the front body structure of the automobile according to the second embodiment, and FIG. It is a sectional side view of vehicle body front part structure of Example 1 near the vehicle width direction both ends.

As shown in FIGS. 6 and 7, in the vehicle body front part structure B of the present embodiment, the length in the front-rear direction of the horizontal portion 3 c of the plate-like member 3 described in the first embodiment is formed, A bracket 9 is provided at the center in the vehicle width direction of the horizontal portion 3c so as to protrude forward.
The bracket 9 has a rear end fixed to the plate-like member 3 and the bumper armature 4 by a fastening member such as a clip C4, and a front end fixed to the rear end of the bumper fascia 6 by a fastening member such as a clip C5.
The number and position of the brackets 9 may be set as appropriate.

Hereinafter, the operation and effect of the vehicle body front part structure B of the vehicle according to this embodiment will be described.
In the vehicle body structure configured as described above, the rear end portion of the bumper fascia 6 is fixed to the plate-like member 3 via the bracket 9, so that the wearing rigidity of the bumper fascia 6 can be improved. .
Further, when the automobile collides with a pedestrian, the bumper fascia 6 is crushed and displaced rearward by colliding with the pedestrian's knee.
At this time, since the rear end portion of the bumper fascia 6 is fixed to the plate-like member 3 via the bracket 9 as described above, the impact of the collision is transmitted from the bumper fascia 6 to the plate-like member 3 via the bracket 9. Can be dispersed and absorbed.

Subsequently, the impact is transmitted to both the first and second impact absorbing members 5a and 5b substantially simultaneously.
At this time, since the rigidity of the second shock absorbing member 5b in the vehicle front-rear direction is set higher than that of the first shock absorbing member 5a, the reaction force against the impact caused by the pedestrian's knees is lower than that of the first shock absorbing member 5a. The second shock absorbing member 5b becomes higher. As a result, the first and second shock absorbing members 5a and 5b are displaced rearward to absorb the shock, while the second shock absorbing member 5b is placed below the pedestrian's knee. It is possible to prevent the pedestrian from being caught in the lower part of the vehicle by applying an outward rotational force.

  At this time, since the plate-like member 3 supports the second impact absorbing member 5b from below and behind, the second impact absorbing member 5b can absorb and disperse the impact while being displaced rearward in a stable state.

  On the other hand, when the automobile collides with a rigid body (for example, a wall or a front vehicle) at a low speed, the straight vertical portion 3b serves as a beam between the bumper stays 2 and 2, so It is possible to prevent separation in the vehicle width direction, thereby preventing the rear members of both the bumper stays 2, 2 such as the radiator core support 1 and the side members 7, 7 from being damaged due to the force in the vehicle width direction, Compared to the conventional invention, damage to the vehicle body can be reduced and increase in repair costs can be suppressed.

  Further, when a plurality of brackets 9 are provided in the vehicle width direction and fixed to the rear end portion of the bumper fascia 6, the wearing rigidity of the rear end portion of the bumper fascia 6 is improved in a wide range, and the bumper fascia 6 is also improved. The impact from can be dispersed more widely.

  As described above, the vehicle body front structure B of the vehicle of the present embodiment has a more compact structure than the conventional invention, and the vehicle is rotated outwardly under the obstacle colliding with the vehicle. Power can be granted.

  Further, since the horizontal portion 3c of the plate-like member 3 and the rear end portion of the bumper fascia 6 are coupled via the bracket 9, it is not necessary to extend the horizontal portion 3c forward over the entire vehicle width direction. The weight of the member 3 can be reduced.

  Although the embodiments of the present invention have been described above, the specific configuration of the present invention is not limited to the embodiments, and the present invention includes any design changes that do not depart from the gist of the invention. It is.

  For example, as shown in FIG. 9, the plate-like member 3 described in the first and second embodiments may be constituted by a plate-like member 30 formed integrally with the bumper armature 4.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall exploded view showing a vehicle body front structure of an automobile according to a first embodiment of the present invention. It is a sectional side view of the vehicle body front part structure of Example 1 near the vehicle width direction center part. It is a sectional side view of vehicle body front part structure of Example 1 near the vehicle width direction both ends. It is a plane sectional view which shows the connection state of a bumper armature, a plate-shaped member, and a bumper stay. It is a figure explaining the effect | action of the vehicle body front part structure of the motor vehicle of Example 1. FIG. It is a whole exploded view which shows the vehicle body front part structure of the motor vehicle of Example 2 of this invention. It is a sectional side view of the vehicle width direction center part vicinity of the vehicle body front part structure of the motor vehicle of Example 2. FIG. It is a sectional side view of vehicle body front part structure of Example 2 near the vehicle width direction both ends. It is a whole exploded view which shows the vehicle body front part structure of the motor vehicle of the other Example.

Explanation of symbols

A, B Car body front structure C1, C2, C3, C4, C5 Clip 1 Radiator core support 1a Radiator core support side 1b Side member mounting part 2 Bumper stay 3, 30 Plate member 3a Horizontal part 3b Vertical part 4 Bumper armature 5a, 5b Shock absorbing member 6 Bumper fascia 6a Wing part 7 Side member 8a, 8b, 8c Support part 9 Bracket

Claims (4)

The first shock absorbing member is arranged between the bumper armature and the bumper fascia,
A second shock absorbing member having a longitudinal rigidity set higher than that of the first shock absorbing member is disposed along the lower surfaces of the first shock absorbing member and the bumper armature;
A vehicle body front structure, wherein a plate-like member is provided along a lower surface and a rear surface of the second shock absorbing member, and the plate-like member is fixed to a bumper armature. In the vehicle body front structure according to claim 1,
The back side of the plate-like member is refracted and formed into a U-shaped cross-sectional shape,
Combining the opposite horizontal parts of the U-shape to the bumper armature,
The both ends of the U-shaped vertical part in the vehicle width direction are coupled to the bumper stay,
A vehicle body front structure of a vehicle, wherein the bumper stays in the vertical part are formed in a straight line parallel to the vehicle width direction. In the vehicle body front structure according to claim 1,
The back side of the plate-like member is refracted and formed into a U-shaped cross-sectional shape,
Combining the opposite horizontal parts of the U-shape to the bumper armature,
Connected in a state in which both ends in the vehicle width direction of the U-shaped vertical part are sandwiched between a bumper stay and a bumper armature,
The vehicle body front structure of an automobile, wherein the vertical portion between the bumpy stays is formed in a straight line parallel to the vehicle width direction. In the vehicle body front part structure according to claim 2 or 3,
A vehicle body front structure for an automobile, wherein a bracket for fixing a rear end portion of a bumper fascia is provided on the plate member.

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